Differential-pattern machine



3 Sh.etsSheet 1.

(Nd Model.)

B CAIRNS DIFFERENTIAL PATTERN MACHINE,

No. 507,783. Patentd-Oot. 3l,-,l893.

3 Sheetsw-Sheefi 2.

(.No Model.)

- 3. CAIRNS.

DIFFERENTIAL PATTERN MAGHINE. N0. 507,783. Patented Oct. 31, 1893.

(No Model.) 3 SheetsSheet 3.

, R; CAIRNS.

' DIFFERENTIAL PATTERN MAGHINE'.

Patented 001;. 31

UNrrnD STATES PATENT FFKCE.

ROBERT CAIRNS, OF WATERTOWN, WISCONSIN.

DIFFERENTIAL-PATTERN MACHINE.

SPECIFICATION forming part of Letters Patent NO. 507,783, dated October 31, 1893.

Application filed May 5, 1893. Serialll'o. 473,053. (No model.)

T0 at whom it may concern.-

Be it known that 1, ROBERT CAIRNS, a citizen of the United States, and a resident of Watertown, in the county of Jefferson, and in the State of Wisconsin, have invented cer-' tain new and useful Improvements in Differential-Pattern Machines; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention has for its object to provide a machine embodying an adjustable pattern for shell-like castings, such for example as belt-pulleys, whereby from one pattern of fixed diameter molds may be made for eastings of various faces, and a further object of my invention is to have a series of adjustable patterns in the same machine, each pattern being of a different diameter; therefore said invention consists in certain peculiarities of construction and combination of parts hereinafter described with reference to the accompanying drawings and subsequently claimed.

In the drawings: Figure 1 represents a vertical transverse section of a difierential pattern machine constructed according to my invention, and the drag portion of a flask in place thereon; Fig. 2, a plan view of the machine and drag, the latter being partly broken away; Fig. 3, a horizontal section taken on line 33.of Fig. l, a portion of the adjustable pattern being broken away and certain other parts of said machine omitted; Fig. 4, a plan view partly in horizontal section on line 4-4 of Fig. 1; Fig. 5,a perspective view of one of a series of columns embodied in the aforesaid machine, and Fig. 6, a detail section taken on line 66 of Fig. 1.

Referring by letter to the drawings A represents the base of my machine, and this base has a central step b for a screw-spindle B keyed at its lower portion in a worm-wheel C that is preferably inclosed by a suitable casing D, and in mesh with a worm E on a shaft F, the latter having its bearings in the casing and a horizontal portion of a bracket G fast on said base. Keyed on the outer end of the shaft F is a bevel-pinion H in mesh with a bevel-gear wheel I fast on a vertical stem J that has its bearing in a parallel portion of the bracket G, and this stem may be actuated by a hand-wheel K or other suitable table.

means to drive the gear in connection therewith.

Bolted to the base A, at certain intervals adjacent to its outer edge, are the flanged lower ends of pillars L, and the flanged upper ends of these pillars are bolted to the underside of a table M having a central opening for the reception of the thickened upper ends of a series of concentric skeleton columns N, O, that also have lower end flanges bolted to said base. All the upper ends of the columns N, O, are flush with the table M, and the innermost column N, shown in detail by Fig. 5, has its upper end extended some distance toward the center of the machine in the form of a flange 0 provided with a seat for the shouldered edge at of a plate P that loosely engages the screw-spindle B to form a bearing for the same, and by means of countersunk screws (2 engaging tapped openings in said flange the plate is detachably secured in position flush with said table. The upper ends of all thecolumns are so spaced as to leave a series of openings or guideways that are normally closed by removable fillers Q having supporting lugsfengaging adjacent seats 9 in said ends of the columns and the adjacent At this point in the description it is proper to state that the concentric columns N, O, are provided with suitable apertures through which the worm-shaft F is passed, and it may also be stated that while I prefer said columns, certain changes compatible with the obtaining of spaces normally occupied by the fillers Q may be made without departure from jahe spirit of my invention. Engaging the screw-spindle B is a nut R, and held on the nut by any suitable means, such for instance as countersunk screws h' engaging tapped openings therein, are mortise joined rings S having arms S that extend outward through interstices of the columns N, O, and are stiffened by braces h connecting their free ends with said nut, as clearly illustrated in Fig. 1, these free ends of the arms being shown as movable between parallel guidebars T adjustably secured to the base and table of the machine for the purpose of compensating for wear. The rings and arms constitute a spider-like support and loose on said arms are grooved slides'U designed to embrace the lower edge of a pattern V when the latter is in position for use, these slides and the pattern being locked together by means gf pins t engaging registering perforations in In assembling the machine or in case of repairs, the support for the patterns is accessible through the innermost skeleton column N, the center plate P at the top of the same being unseated.

The machine herein shown is designed for a series of patterns, each of which has a diameter greater or less than any of the others in the series, and the number and diametrical dimensions of these patterns correspond with the fillers Q, above specified. In practice a pattern of the desired diameter is substituted for a filler of like diameter, and after being made fast to the traveling support the pattern may be raised or lowered at will to project beyond the upper end of the machine a distance equal to one-half the width of the face of the casting to be produced, this adjustment being effected by means of the worm-gear hereinbefore set forth.

The present machine is organized as one upon which to set up molds for belt-pulleys of various diameters and faces, and for each rim pattern there is corresponding pattern W for the spider portion of a complete pulley, this latter pattern being provided with a depending centering lug j that en gages a corresponding seat in the upper portion of said machine. For the hubs of the pnlleysI may employ various sizes of patterns, and any one of the latter will be centered on the spiderpattern as is usual in the art. The patterns having been properly positioned, they are surrounded by a drag X placed bottom up on the table M, the usual perforated lugs [6 of the drag being engaged by collared dowels Y having detachable connection with said ta"- ble. The drag-section of the mold having been made in the usual manner it is removed and a cope positioned on the table, the usual dowels on this cope being inserted in the per forations or seats 772 made vacant by the moval of the aforesaid dowels Y, whereby said cope is held in place during the operation of completing the mold.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1-. The combination of a suitable table for the temporary support of a drag or cope, a

series of concentric guideways within the confines of the table, removable fillers for the guideways, patterns interchangeable with the guideway fillers, and suitable means for vertically adjusting a pattern in its guideway, substantially as set forth.

2. The combination of a base, a suitable table supported above the base, a series of concentric guide-ways within the confines of the table, removable fillers for the guideways, a rotative screw-spindle interposed between said base and table, a support having a nutconnection with the spindle, slides normally loose on the support, patterns interchangeable with the guideway-fillers, and suitable means for looking a pattern to said slides, substantially as set forth.

The combination of a base, a series of pillars fast on the base, a table supported on the pillars, a series of concentric skeleton columns secured to the base and having their upper ends spaced within the confines of the table in such a manner as to leave guideways, removable fillers for the guide-ways, a closure for the upper end of the inner column, patterns interchangeable with the guide-way fillers, and suitable means for vertically adjusting a pattern in its guideway, substantially as set forth.

4:. The combination of a base, a series of pillars fast thereon, a table fast to the pillars, a series of concentric skeleton columns secured to the base and having their upper ends spaced within the confines of the table in such a manner as toleaveaseries of guideways, removable fillers for the guideways, a center-plate seated in the innermost column, a screw-spindle loose in said base and centerplate, a suitable gearing for the rotation of the spindle, a nut on said spindle, a spiderlike support fast on the nut, guides for the arms of the support, slides normally loose on said arms, pat-terns interchangeable with the guideivay fillers, and suitable means for looking a pattern to said slides, substantially as set forth.

In testimony that I claim the foregoingI have hereunto set my hand, at VVaterto'w1'1,in the county of Jeffersonand State of \Viscon sin, in the presence of two witnesses.

ROBERT CAIRNS.

Witnesses:

J. R. BEYNON, CHAS. J. WENOK. 

